I have a LET tune on my Aero and have been VERY happy with it....... mine is not a dyno tune... I sent the ECU in for the 'custom' tune to match my mods and then had it re-tuned once with input from a dyno run..... I drive the Aero around town and at the track when I get the chance.... you should not have any problems with the car due to the tune.....well, maybe you gas mileage might suffer...